Earlier in this chapter we discussed Ceph settings defined in the ceph.conf config file. When present as each Ceph daemon starts up, these settings override compiled-in defaults. To borrow a term from the network router world, ceph.conf is an example of stored, startup or saved config. As circumstances cause us to adjust or augment these explicit file-based settings we can effect them by rolling restarts of Ceph daemon processes or even server reboots.
While Ceph's resilient and fault-tolerant architecture affords us the flexibility to carefully apply configuration changes by service restarts, there is faster and less disruptive method: injection.
Ceph's injection mechanism is a handy and nearly immediate way to affect Ceph's ...
